I think the dip just allows you to add the solution a lot slower and finer, but overall it will not affect your results if you fill the syringe full of the solution, no air bottles, all the way to 1 ml. Think about it, you are just measuring how much solution you are dispensing... with the tip, you can actually drop up more than the 1 ml the syringe can hold...but when you dispense, you are counting how many units you are dispensing starting from 1ml down...if you dont use the tip, but fill the syringe up to 1ml and have no air bubbles in it...when you dispense, you are still counting down how many units are used... hope that made sense.
Anyways, the tips are there for a reason, so use them if you can.
G